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|  MIL-W-70467 (AR)
4. 5.5 S&A tests.
4. 5.5.1 Spring embrittlement. The spring shall be stretched
along its longitudinal axis in the case of a coil spring, or bent in
the case of a flat spring, until the spring no longer returns to its
original position. When the spring no longer returns to its
original length or profile, it shall be considered distorted
permanently. Any spring that breaks prior to this point shall be
classed defective.
4.5.5.2 Setback weiqht sprinq set. The springs shall be
measured at their original free length, assembled in a restraining
fixture in accordance with 4.4.4 and compressed to a normal height
of .750 inches, placed in an oven and subjected to a temperature of
not more than 180 degrees Fahrenheit (F) or less than 170F for
24 hours. The springs shall be removed from the oven and be cooled
to ambient temperature. After cooling the springs for 24 hours
minimum, the springs shall be measured and the measurement shall be
compared to the original free length to ascertain compliance with
the specified requirement. Any spring that fails the requirement
shall be classed defective.
4.5.5.3 Load test of No. 1 gear and pinion assembly. Apply an
axial load perpendicular to the No. 1 gear and in such a direction as
to test the-assembly of the No. 1 gear and pinion. The required
force shall act against the No. 1 gear. Upon removal of the
required force, the maximum permissible gap shall be inspected for
compliance with the drawing requirement. Any No. 1 gear and pinion
assembly that fails the requirement shall be classed defective.
4.5.5.4 Load test of No. 2 gear and pinion assembly. Apply an
axial load perpendicular to the No. 2 gear and in such a direction as
to test the assembly of the No. 2 gear and pinion. The required
force shall act against the No. 2 gear. Upon removal of the
required force, the maximum permissible gap shall be inspected for
compliance with the drawing requirement. Any No. 2 gear and pinion
assembly that fails the requirement shall be classed defective.
4.5.5.5 Load test of escapement gear and pinion assembly.
Apply an axial load perpendicular to the escapement gear and in such
a direction as to test the assembly of the escapement gear and
pinion. The required force shall act against the escapement gear.
Upon removal of the required force, the maximum permissible gap
shall be inspected for compliance with the drawing requirement. Any
escapement gear and pinion assembly that fails the requirement shall
be classed defective.
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